Fire And Explosion Prevention; Metal Fume Hazards; Reccomendations Of Reducing Emissions - Air Liquide FRO PRACTIC 191/2 User Manual

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1.3

FIRE AND EXPLOSION PREVENTION

cause fire outbreaks. Explosions and fires can
be prevented by following the procedure
described below:
1. Clear away or protect inflammable objects and
substances (wood, saw dust, clothing, paints,
solvents, petrol, kerosene, natural gas, acety-
lene, propane, etc.) with fire-proof material.
2. Keep extinguishing means, such as fire extin-
guishers, water and sand, within easy reach.
3. Never weld or cut closed containers or pipes.
4. Never weld or cut containers or pipes (even
open) containing or which have contained
substances that could give rise to explosions
or other dangerous reactions when exposed to
humidity or heat sources.
5. Tubes and containers must be opened, emp-
tied and thoroughly cleaned before welding.
Welding operations on these parts must be
performed with the utmost caution.
1.4

METAL FUME HAZARDS

Welding fumes and gases may be haz-
ardous if inhaled for long periods of time.
1. Install a natural or forced-air ventilation sys-
tem in the work area.
2. Use a forced-air ventilation system when
welding lead, beryllium, cadmium, zinc, zinc-
coated or painted materials; wear a protective
mask.
3. If the ventilation system is inadequate, use an
air respirator.
4. Beware of gas leaks. Shield gases such as
argon are denser than air, and when used in
confined spaces will replace it.
5. In the event of welding operations in confined
places (e.g. inside boilers, trenches), the
welder should be externally accompanied by
another person. Always observe accident-pre-
vention procedures.
6. Keep gas cylinders in a well-ventilated area.
7. Close the main valve when gas cylinder is not
in use.
8. Do not perform welding operations near chlo-
rinated hydrocarbon vapours produced by
degreasing or painting; the heat generated by
18

RECCOMENDATIONS OF REDUCING EMISSIONS.

Hot slag and sparks can
arc rays can react to form phosgene, a highly
toxic gas.
9. Irritation of the eyes, nose and throat are
symptoms of inadequate ventilation. Take
immediate steps to improve ventilation. Do
not continue welding if symptoms persist.
2.0 RECCOMENDATIONS OF REDUCING
EMISSIONS.
1. WARNING. This welding power source has
been designed to work for professional and
industrial use; for other applications to contact
the manufactures
2. WARNING. The user is responsible for install-
ing and using the welding equipment accord-
ing to the manufacturers instructions. If
electromagnetic disturbances are detected
then it shall be the responsibility of the user of
the welding equipment to resolve the situation
with the technical assistance of the manufac-
turer. In some cases this remedial action may
be as simple as earthing the welding circuit,
see ATTENTION. In other cases it could
involve constructing an electromagnetic
screen enclosing the power source and the
work complete with associated input filters. In
all cases electromagnetic disturbances must
be reduced to the point where they are no
longer troublesome.
3. ATTENTION. The welding circuit may or may
not be earthed for safety reasons. Changing
the earthing arrangements should only be
authorised by a person who is competent to
assess whether the changes will increase the
risk of injury, e.g. by allowing parallel welding
current return paths which may damage the
earth circuits of other equipment.
4. WARNING. Extra precaution may be required
when the welding power source is used in a
domestic establishment.
5. WARNING. Special measures shall be taken to
achieve compliance with welding power
source including HF frequency for arc ignition
and stabilizing; it may be required use of
shielded cables and in any case to resolve the
particular implementation (e.g. with robot,
computer and any other electrical and elec-
tronic equipment connected to welding power
source) to call the technical assistance of the
manufacturer.